Synthesis And Characterization Of Tropolone Azo Metal-complexes

The metallized complexed azo dyes are important metallized complexed dyes used for protein(wool and silk) and polyamide fibers.Conventional metallized azo dyes,containing heavy metal ions such as chromium(â…¢), cobalt(â…¡) produce a large amount of industrial wastewater,which seriously polluting the ecological environment.Since 1980s,the contents of heavy metal ion Cr³⁺,Co²⁺ have strictly been limited in textile.At the same time,the price of copper salt and zinc salt is far lower than chromium salt and cobalt salt.So,it is very important to find environmentally friendly copper(â…¡), zinc(â…¡) and rare europium(â…¢) ion complex dyes as viable alternatives.The azo compound has the illumination performance,synthesizes the rare earth azo dyes,not only advantageous because of its special electronic structure to the dyeing carries on smoothly,the improvement coincidence speed,enhance the level dyeing effect,in rare earth ion and dye member aromatic nucleus structure and other conjugate system union,will cause its excitation energy to reduce.At the same time,is advantageous in causes the dye member the biggest absorption wave to the long wave shift,because this possibly is dyes using the rare earth has one of deep color effect attributes. Moreover the rare-earth element has the specific incisive absorption band in infrared and the ultraviolet visible light area,therefore,its dyeing product luster is bright,is pure.In the paper,tropolone was selected as coupling component to react with respectively with the diazotization components,4-Aminophenol, o-Nitroaniline and 2-amino-4-nitropheno-6-sulfoacid to have synthesized to three mordant dyes,for preparation of metallized complexed azo dyes.Also, the structures of and the character of the metallized mordant dyes were determined by IR,UV,¹HNMR.The above-mentioned three dyes were employed,as intermediates to complex respectively with copper(â…¡),zinc(â…¡) and rare europium(â…¢) salts,to prepare nine metallized complexed acidic azo dyes,among which the structures of metallized complexed azo dyes were determined by IR,UV, lHNMR.In synthesizing the complex dyes,the pH value of reaction system was both 7.0～8.0.Meanwhile the reaction temperature of metallized complexed dyes was both 75～80℃By the visible spectra analysis,the structure of the complexed dyes were determined and the metallized complexed dyes characterized,which showing that the maximum absorption wavelength of metallized complexes is between 300nm～550nm,which showed the color of fresh yellow.Furthermore,due to coordinate the metal ion,some metallized complexed dyes appeared shoulder peak.